Metal pipe.



No. 683,519. Patented Oct. I, l90l. J. H. TAYLOR.

IETAL PIPE.

(Lpplielflon am Sept. 29, 1900.

(No Model.)

Tn: new but!- co. mom-urn WW. 0. c.

UNITED STATES I PATENT OFFICE.

JAMES HALL TAYLOR, OF CHICAGO, ILLINOIS.

METAL PIPE.

SPECIFICATION forming part of Letters Patent No. 683,519, dated October 1, 1901.

I Application filed September 29, 1900. Serial No. 31,543. (No model.)

To all whom it may concern:

Be it known that I, JAMES HALL TAYLOR, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Metal Pipe, (Case No. 4,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to pipe that is formed by riveting sheet metal in the required shape and length. Heretofore the pipe has either been so constructed that the heads of the rivets upon the interior thereof projected to their full extent within the interior of the pipe, thereby decreasing the capacity of the pipe, increasing the friction to a fluid flowing through the same, and afiording obstruction and lodging places for subdivided solid matter passing through the pipe, whereby the usefulness of riveted pipe is seriously impaired,or the inner rivet-heads have been contained within countersunk holes,which would materially weaken the pipe and permit impairment of the metal immediately surrounding the inner rivet-heads contained in the countersunk openings, the moisture or other deleterious agency finding its way between the inner heads and the surrounding metal. Moreover, pipes provided with countersunk rivet-openings have to be made of thicker metal, as it would be impossible to securely fasten the same were very thin sheet metal employed. Y

My invention is particularly adaptable for use in connection with pipe formed of spirally-wound sheet metal having overlapping edges through which the rivets are passed to maintain the spirally-disposed sheet metal in the form of the pipe.

In accordance with my invention indentations are provided upon the interior of the pipe that surround and receive the inner rivet-heads to remove the same either wholly or partially outwardly from the circumference of the pipe,theindentations being formed around the rivet-openings without countersinking the same, the rivet-headsbeinglarger than the rivet-openings and thoroughly sealing the same, whereby these rivet-heads are either wholly or partially prevented from affording obstruction to material flowing through the pipe, so that the various objections heretofore mentioned are overcome. I prefer to form the indentations upon the interior of the pipe sufliciently deep to contain the entire rivet-heads, whose tops are preferably made flush with the inner face of the pipe, so that when the pipe is viewed endwise no portion of the heads will be seen to project inwardly. These indentations are preferably formed by bulging the metal outwardly where each rivet is placed, the thickness of the metal preferably not being impaired by having the overlapping edge portions of the metal both bulging outward. I11 this connection reference may be had to my copending application, Serial No. 3,791, filed February 3, 1901.

I will explain my invention more fully by reference to the accompanying drawings, illustrating the preferred embodiment thereof as employed in connection with spirally-formed pipe, in which- Figure 1 is a longitudinal sectional View of a part of a pipe constructed in accordance with the invention, and Fig. 2 an end view of the structure illustrated in Fig. 1.

Like parts are indicated by similar letters of reference in both views.

The pipe is preferably formed by spirally winding a strip of sheet metal, as iron, the edge portions of the sheet metal overlapping, as is clearly indicated. Rivets a a are passed through the overlapping edge portions of the sheet metal, the rivets preferably being of the form shown, having inner heads upon the interior of the pipe, the heads of each rivet be in g sufficiently compressed toward each other to thoroughly clamp the metal between the same. Where each rivet is located an indentation Z) is preferably provided upon the interior of the pipe that preferably projects outwardly from the pipe suiiiciently to contain the entire inner rivet-head to remove the same from the bore of the pipe. I do not wish to be limited, however, to the entire removal of the inner rivet-heads from the bore of the pipe. By forming these indentations the inner edge portion 0 is bulged outwardly, as is also the outer overlapping portion of the sheet metal d, the outer protuberance of the inner portion 0 fitting the inner recess formed in the portion 61, in which latter portion a bulge is formed, the apex of which is directly engaged with the outer rivet-head. It will be observed that the indentations formed in the portions 0 and d are had without removing any of the metal. Where the portions 0 and (l of the metal forming the pipe overlap an offset is preferably provided in the outer portion d at e, which forms a spiral recess upon the interior of the pipe that receives the inner portion 0, so that a smooth bore of uniform-diameter is provided for the pipe.

The outwardly-extending depressions in the pipe are, together with the rivets, located in a spiral line and do not communicate with each other-that is, each inner rivet-head is contained in its own surrounding depression or indentation that contains no other rivethead.

By means of my present invention it will be apparent that many advantages are secured over structures of the prior art, and while I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise construction shown, as modifications may be made without departing from the spirit of my invention; but,

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. As a new article of manufacture, a pipe formed of spirally-wound sheet metal having spirally-alined rivets passed through overlapping edge portions of the metal, the pipe being provided with spirally-alined, outwardly-bulging, non-communicating indentations, each receiving a single inner rivethead, substantially as described.

2. As a new article of manufacture, a pipe formed of spirally-wound sheet metal having overlapping edge portions through which spirally alined rivets are passed, the inner edge portions of the metal bulging outwardly to form spirally-alined, non communicating recesses, each receiving a single inner rivethead, the outer edge portions of the sheet metal correspondingly bulging outwardly to receive the bulges of the inner edge portions, substantially as described.

3.v As a new article of manufacture, a riveted pipe provided with non-communicating, alined indentations upon the interior thereof, and rivets whose inner heads are received in said indentations, each indentation receiving a single rivet-head, which heads extend beyond and seal the rivet-openings, substantially as described.

4. As a new article of manufacture, a pipe form ed of spirally-wound sheet metal, having overlapping edge portions through which spirally-alined rivets are passed, the inner .edge portions of the metal bulging outwardly to form spirally-alined, non-communicating recesses, each receiving a single inner'rivethead, the outer edge portions of the sheet metal correspondingly bulging outwardly to receive the bulges of the inner edge portions, a spirallyformed ofiset being provided in the outer overlapping edge portion to form a spiral recess upon the interior of the pipe that receives the inner edge portion, substantially as described.

In witness whereof I hereunto subscribe my name this 27th day of September, A. D. 1900.

JAMES HALL TAYLOR. 

